code: def apply(self, df, k, condition):
      df[k] = df["features"].apply(condition)
      df[k] = df[k].astype(np.int8)
  
file_path: mlcourse.ai/jupyter_russian/topic06_features/demo.py
imports: import numpy
  import pandas
  import json
  from sklearn.base import TransformerMixin
label_desc: Use image node_id 1 for calling the FeatureEngineer obj's underlying member method code with example usage: obj.apply(df, k, condition) without return types